The U.S. Supreme Court’s ruling that upheld the Arizona Independent Redistricting Commission’s right to draw congressional boundaries opened the door for a second, long-dormant challenge to the districts to move forward.

The U.S. Supreme Court ruled upheld the Arizona Independent Redistricting Commission’s authority to draw congressional districts, defying expectations that it would return that power to the Legislature for the first time in more than 20 years.

If the U.S. Supreme Court returns authority for congressional redistricting to the Legislature, lawmakers will have to become familiar again with a process they haven’t used in nearly a quarter century.